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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Rapid eruption of silicic magmas from the Parana magmatic province (Brazil) did not trigger the Valanginian event

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Rocha, Brenda C. [1, 2] ; Davies, Joshua H. F. L. [2, 3] ; Janasi, Valdecir A. [1] ; Schaltegger, Urs [2] ; Nardy, Antonio J. R. [4] ; Greber, Nicolas D. [2, 5] ; Lucchetti, Ana Carolina F. [4] ; Polo, Liza A. [1]
Total Authors: 8
[1] Univ Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo - Brazil
[2] Univ Geneva, Dept Earth Sci, CH-1205 Geneva - Switzerland
[3] Univ Quebec Montreal, Dept Sci Terre & Atmosphere, Montreal, PQ H2X 3Y7 - Canada
[4] Univ Estadual Paulista, Inst Geociencias & Ciencias Exatas, BR-13506700 Rio Claro - Brazil
[5] Univ Bern, Inst Geol Sci, CH-3012 Bern - Switzerland
Total Affiliations: 5
Document type: Journal article
Source: GEOLOGY; v. 48, n. 12, p. 1174-1178, DEC 2020.
Web of Science Citations: 0

The Valanginian Stage is marked by a period of global positive delta C-13 carbon cycle perturbation and biotic crises, which are collectively referred to as the Valanginian event (VE). Many attempts have been made to link the Parana-Etendeka large igneous province volcanism with the VE. However, currently there is no conclusive proof to support this hypothesis, since the timing and duration of the volcanic activity are not known with sufficient precision. In this study, we significantly revise the time scales of magmatism and environmental impact of the Parana magmatic province (PMP) in Brazil with new high-precision zircon U-Pb ages from the low-Ti Palmas and high-Ti Chapeco sequences. Our data demonstrate that significant volumes of low-Ti silicic rocks from the PMP erupted rapidly at ca. 133.6 Ma within 0.12 +/- 0.11 k.y. The age of the high-Ti Chapeco sequence from central PMP is constrained at ca. 132.9 Ma and thus extends the duration of magmatic activity by similar to 700 k.y. Our new ages are systematically younger than previous ages and postdate the major positive carbon isotope excursion, indicating that PMP silicic magmatism did not trigger the VE but could have contributed to extending its duration. Within the framework of the stratigraphic column of the PMP, the earliest low-Ti basalts could have been responsible for the VE if they are at least 0.5 m.y. older than the low-Ti silicic rocks dated herein. (AU)

FAPESP's process: 12/06082-6 - The Paraná-Etendeka magmatic province in Brazil: temporal and petrologic relationships between the tholeiitic and alkaline magmatism and geodynamic implications
Grantee:Excelso Ruberti
Support type: Research Projects - Thematic Grants
FAPESP's process: 16/23266-4 - Age and duration of acid magmatism in the Paraná Magmatic Province from 40Ar-39Ar sanidine and U-Pb zircon and baddeleyite dating
Grantee:Brenda Chung da Rocha
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 19/24872-3 - Revisiting the age of the mafic intrusive magmatism in the Paraná Magmatic Province through high-precision U-Pb geochronology
Grantee:Brenda Chung da Rocha
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 17/18220-8 - Refining the chronostratigraphy of the silicic magmatism of the Paraná Magmatic Province using the zircon U-Pb chemical abrasion (CA-ID-TIMS) dating technique
Grantee:Brenda Chung da Rocha
Support type: Scholarships abroad - Research Internship - Post-doctor